Download Sennheiser EK3253 Specifications

EK 3253
Instructions for use
Contents
Safety instructions .......................................................................... 6
Delivery includes ............................................................................. 7
EK 3253 bodypack receiver ........................................................... 8
The operating controls ................................................................... 9
Indications and displays .............................................................. 10
The LC display .......................................................................... 10
Preparing the receiver for use .................................................... 13
Inserting and replacing the batteries ................................. 13
Inserting and charging the accupack ................................. 14
Using the receiver ......................................................................... 15
Switching the receiver on/off .............................................. 15
Connecting the headphones ................................................. 15
Adjusting the volume ............................................................ 16
Adjusting the balance/FOCUS .............................................. 17
Activating/deactivating the lock mode ............................. 17
Attaching the receiver to clothing ...................................... 17
The operating menu ..................................................................... 18
The buttons ............................................................................. 18
Overview of menus ................................................................ 19
Working with the operating menu ..................................... 20
The operating menu of the receiver .......................................... 22
Adjustment tips for the operating menu ................................. 24
Selecting a channel – CHAN .................................................. 24
Selecting the frequencies to be stored in the
channel bank “U” – TUNE ..................................................... 24
Scanning the channel bank for free channels – SCAN .... 25
Adjusting the squelch threshold – SQELCH ....................... 25
Stereo/FOCUS selection – ST-FOC ........................................ 27
Limiting the volume at the headphone output – LTD ..... 27
Activating/deactivating the frequency boost – HI-BST . 27
Selecting the standard display – DISLPY ........................... 28
Entering a name – NAME ...................................................... 28
Loading the factory-preset default settings – RESET ..... 29
Activating/deactivating the pilot tone
evaluation – PILOT .................................................................. 29
Activating/deactivating the lock mode – LOCK ............... 29
Exiting the operating menu – EXIT ..................................... 30
If problems occur ... .......................................................................
Error checklist ..........................................................................
Recommendations and tips ........................................................
Maintenance and care ..................................................................
Additional information ................................................................
Squelch .....................................................................................
Specifications .................................................................................
Connector assignment ...........................................................
Accessories ..............................................................................
31
31
32
32
33
34
35
36
36
Thank you for choosing Sennheiser!
We have designed this product to give you reliable operation
over many years. Over sixty years of accumulated expertise in
the design and manufacture of high-quality electro-acoustic
equipment have made Sennheiser a world-leading company in
this field.
Please take a few moments to read these instructions carefully,
as we want you to enjoy your new Sennheiser products quickly
and to the fullest.
Safety instructions
y Please read these instructions carefully and completely
before using the receiver.
y Make these instructions easily accessible to all users at all
times. Always include these instructions when passing the
receiver on to third parties.
y Never open electronic units! If units are opened by customers
in breach of this instruction, the warranty becomes null and
void.
y Water entering the housing of the receiver can cause a shortcircuit and damage the electronics. Protect the receiver from
damp and wet. Only use a slightly damp cloth to clean the
receiver.
y Follow the safety instructions on the receiver.
Attention! High volume!
This is a professional transmission system.
Commercial use is subject to the safety-at-work
regulations. Sennheiser, as the manufacturer, is
therefore obliged to expressly point out possible
health risks arising from use.
This system is capable of producing sound pressure exceeding
85 dB(A). 85 dB(A) is the sound pressure corresponding to the
maximum permissible volume which is by law (in some
countries) allowed to affect your hearing for the duration of a
working day. It is used as a basis according to the specifications
of industrial medicine. Higher volumes or longer durations can
damage your hearing. At higher volumes, the duration must be
shortened in order to prevent damage. The following are sure
signs that you have been subjected to excessive noise for too
long a time:
y You can hear ringing or whistling sounds in your ears.
y You have the impression (even for a short time only) that
you can no longer hear high notes.
6
Intended use of the receiver
Intended use includes
y having read these instructions especially the chapter “Safety
instructions”.
y using the receiver within the operating conditions as
described in these instructions.
Improper use
Improper use is when you use the receiver other than described
in these instructions or when you use the receiver under
operating conditions different from those described in these
instructions.
Delivery includes
y
y
y
y
1 EK 3253 bodypack receiver
2 batteries
1 pair of IE 4 earphones
Instructions for use
7
EK 3253 bodypack receiver
With the wireless in-ear monitoring system, consisting of the
SR 3254 or SR 3256 stereo transmitter and the EK 3253
bodypack receiver, musicians, video and sound amateurs,
reporters/broadcasters, etc. can directly monitor the received
sound signals without troublesome cables or monitor speakers
being required. In addition, the system can also be used for any
application where talkback signals are to be transmitted.
The system has superb audio quality with an increased signalto-noise ratio and dynamic range due to the inclusion of
Sennheiser’s HDX noise reduction system.
The EK 3253 bodypack receiver has the following features:
y Easy to use
y FOCUS function for individual audio mix
y Pilot tone squelch control (during stereo operation)
y Receiving frequencies tunable in steps of 5 kHz
y Scan function for scanning the channel banks for free
channels
The channel bank system
The EK 3253 receiver is available in five UHF frequency ranges:
Range A:
518 to 554 MHz
Range B:
626 to 662 MHz
Range C:
740 to 776 MHz
Range D:
786 to 822 MHz
Range E:
830 to 866 MHz
The receiver has two channel banks with up to 16 switchable
channels each. The channels of the channel bank “F“ (fixed
bank) have been factory-preset to customer-specific receiving
frequencies. These frequencies cannot be changed.
The channel bank “U” (user bank) allows you to freely select
and store frequencies.
Recommended transmitters
y SR 3254/SR 3256
8
The operating controls
Headphone output
(PHONES), 3.5 mm jack
socket
Antenna
Red LED for operation and
battery status indication
(LOW BAT/ON)
Green LED for RF signal
indication (RF)
Charging contacts
SET button
/ rocker button
(UP/DOWN)
Battery compartment
Battery compartment
cover
Unlocking button
ESC button
LC display
On/off/volume control
9
Indications and displays
The LC display
Alphanumeric display
“B.CH“ – appears when the channel bank and the channel
number are displayed
“MHz“ – appears when the frequency is displayed
4-step battery status display
Lock mode icon (lock mode is activated)
“PILOT” display (pilot tone evaluation is activated)
“MUTE” display (audio output is muted)
7-step level display for audio signal “AF”
7-step level display for RF signal “RF”
Operation and battery status indication
The red LED (LOW BAT/ON) provides information on the
current operating state of the receiver:
10
Red LED lit up:
The receiver is switched on and the capacity
of the batteries/accupack is sufficient.
Red LED flashing: The batteries are/the accupack is going flat
(LOW BAT)!
In addition, the 4-step battery status display on the display
panel provides information on the remaining battery/accupack
capacity:
3 segments:
capacity approx. 100 %
2 segments:
capacity approx. 70 %
1 segment:
capacity approx. 30 %
Battery icon flashing:
LOW BAT
Modulation display of the received transmitter
The level display for audio signal “AF” shows the modulation of
the received transmitter. When the transmitter’s audio input
level is excessively high, the level display for audio signal “AF”
shows full deflection.
“MUTE” display
The “MUTE” display appears on the display panel when the
RF signal of the received transmitter is too weak.
11
“PILOT” display
The “PILOT” display appears on the display panel when the
pilot tone evaluation is activated (see “Activating/deactivating
the pilot tone evaluation – PILOT” on page 29).
RF signal indication
The level display for RF signal “RF” shows the strength of the
received RF signal. In addition, the green LED (RF) at the
front of the receiver lights up when an RF signal is being
received.
However, the green LED (RF) does not light up when the audio
output is muted because
y the RF signal of the received transmitter is too weak,
y the transmitter is set to mono operation and the receiver’s
pilot tone evaluation is deactivated.
Display backlighting
After pressing a button, the display remains backlit for approx.
10 seconds.
12
Preparing the receiver for use
Inserting and replacing the batteries
For powering the EK 3253 receiver, two 1.5 V AA size batteries
are required.
Press the two unlocking buttons and open the battery
compartment cover .
Insert the two batteries as shown in the diagram above.
Please observe correct polarity when inserting the
batteries.
Close the battery compartment. The battery compartment
cover locks into place with an audible click.
13
Inserting and charging the accupack
The receiver can also be powered via the rechargeable
Sennheiser BA 2015 accupack. Insert the accupack into the
battery compartment as described above.
The receiver has two charging contacts and a sensing
contact on its short sides. The accupack can be recharged while
remaining in the receiver. Insert the receiver into the L 2015
charger (see operating manual of the L 2015 charger).
Note:
For accupack operation of the receiver, only use the
BA 2015 accupack in order to ensure optimum operational
reliability. Batteries and rechargeable battery cells have
different discharging curves. The receiver is able to identify
the BA 2015 accupack and to use its capacity to the full.
Individual rechargeable battery cells will not be identified
as accupacks.
14
Using the receiver
Switching the receiver on/off
To switch the receiver on, turn the volume control to the
right until it clicks. The red LED lights up.
To switch the receiver off, turn the volume control to the
left until it clicks. The red LED goes off.
Note:
y The receiver has a short switch-on delay.
y Remove the batteries or the accupack when the receiver
will not be used for extended periods of time.
Connecting the headphones
Attention! High volume!
Even short exposure to high volume levels can damage your
hearing! Set the volume for the connected headphones to
the minimum before putting the headphones on. Do not
listen at higher volume levels than with loudspeakers.
15
Connect the supplied earphones or any Sennheiser stereo
headphones with 3.5 mm stereo jack plug to the
headphone output (PHONES) .
First, set the volume control to the lowest volume by
turning it to the left as far as possible. Then gradually turn
up the volume.
Adjusting the volume
Use the volume control to adjust the volume of the connected headphones.
16
Adjusting the balance/FOCUS
During stereo operation – and provided that the standard
display is shown – the / rocker button serves to adjust
the balance between the left and right stereo signal.
During FOCUS operation, the / rocker button serves to
adjust the relative levels of the two separate channels in the
mixed mono signal (see “Stereo/FOCUS selection – ST-FOC” on
page 27).
Activating/deactivating the lock mode
The receiver has a lock mode that can be activated or
deactivated via the operating menu (see “Activating/
deactivating the lock mode – LOCK” on page 29).
Attaching the receiver to clothing
The receiver is attached to clothing (e.g. belt, waistband) with
the supplied belt clip.
The clip is detachable so that you can also attach the receiver
with the antenna pointing downwards. To do so, withdraw the
clip from its fixing points and attach it the other way round.
17
The operating menu
The buttons
Buttons
SET
/
ESC
18
Mode
To ...
Standard
display
get into the operating menu
Operating
menu
get into the setting mode of the
selected menu
Setting
mode
store the settings and return to the
previous menu level
Standard
display
In stereo operation:
adjust the balance between the left
and right stereo signal
In FOCUS operation:
adjust the relative levels of the two
separate channels in the mixed
mono signal (see “Stereo/FOCUS
selection – ST-FOC” on page 27)
Operating
menu
change to the previous menu () or
change to the next menu ()
Setting
mode
adjust the setting of the selected
menu: option (/)
Standard
display
without function
Operating
menu
cancel the entry and return to the
standard display
Setting
mode
cancel the entry and return to the
standard display
Overview of menus
Display
Function of the menu
CHAN
Selecting a channel
TUNE
Setting a receiving frequency for the
channel bank “U” (user bank)
SCAN
Scanning the channel bank for free channels
SQELCH
Adjusting the squelch threshold
ST-FOC
Stereo/FOCUS selection
LTD
Limiting the volume at the headphone output
HI-BST
Activating/deactivating the frequency boost
DISPLY
Selecting the standard display
NAME
Entering a name
RESET
Loading the factory-preset default settings
PILOT
Activating/deactivating the pilot tone
evaluation
LOCK
Activating/deactivating the lock mode
EXIT
Exiting the operating menu and returning to
the standard display
19
Working with the operating menu
By way of example of the “TUNE” menu, this section describes
how to use the operating menu.
After switching on the receiver, the standard display is shown
on the display panel.
Getting into the operating menu
Press the SET button to get from the standard display into
the operating menu.
The last menu selected flashes on the display.
Selecting a menu
Press the / rocker button to select a menu.
Press the SET button to get into the setting mode of the
selected menu. The current setting that can be adjusted
flashes on the display.
20
Adjusting a setting
Press the / rocker button to adjust the setting.
By briefly pressing the / rocker button, the display jumps
either forwards or backwards to the next setting. In the
“CHAN”, “TUNE”, “NAME” and “BAL/FOC” menu, the /
rocker button features a “fast search” function. If you hold
down a button, the display cycles continuously. The “fast
search” function allows you to get fast and easily to your
desired setting.
The new setting flashes on the display until it is stored.
Storing a setting
Press the SET button to store the setting. “STORED”
appears on the display, indicating that the setting has been
stored. The display then returns to the previous menu level.
With most menus, new settings become effective
immediately without having to be stored. An exception is
the “RESET” menu. With this menu, new settings only
become effective after they have been stored (“STORED”
appears on the display, indicating that the setting has been
stored).
Exiting the operating menu
Select the “EXIT” menu to exit the operating menu and to
return to the standard display.
21
The operating menu of the receiver
EXIT
SET
CHAN
SET
F.01
F.02
B.CH
Current channel or current
frequency
Changing the channel
STORED
Press SET
for 1 sec.
TUNE
Setting the frequency
for channel bank “U”
U.01
B.CH
Channel U.01 …
U.16
Selects the channel
U.02
B.CH
Channel
Selects the channel
Current channel
SET
SET
530.050
530.100
STORED
MHz
Receiving frequency
in steps of 5 kHz
Stores the setting
SET
U.
SCAN
START
09 CH FREE
SET
STORED
SQELCH
U.
CLEAR
: CLEAR, START
/
Scanning
for free channels
SET
Setting the squelch
threshold
Start scan = START
SET: Scans for free
channels
Delete result = CLEAR
SET: Releases locked
channels
SQ LO
Current squelch
threshold
MHz
Current frequency
im Kanal
eingestellten
SQ HI
/
:
LO, MID, HI
SET: Stores the setting
STORED
ST--FOC
SET
Switching between stereo
and FOCUS operation
STEREO
Current setting
FOCUS
/
:
Stereo, Focus
SET: Stores the setting
STORED
SET
LTD
LTD.OFF
Limiter activated or
deactivated
Limiting the volume at
the headphone output
LTD. ON
Stores the setting
STORED
HI--BST
Boosting the
AF frequency response
SET
HB.OFF
Stores the setting
STORED
DISPLAY
22
HB. ON
Frequency boost
activated or deactivated
HI-BST
SET
DISPLY
CHAN
Current standard
display
Switching between the
standard displays
NAME
/ : FREQ, NAME,
CHAN
SET: Stores the setting
STORED
SET
NAME
Assigning the receiver
a name
VOCAL
GUCAL
Current receiver name
/
:
Name (6 characters)
Letters w/o pronounciation
marks, numbers from 0…9,
special characters, spaces
SET: next character,
then store
STORED
SET
RESET
RST. OK
RST. NO
Security check
Loading the factorypreset default values
"reset" = OK
SET: Receiver loads
factory-preset default
settings, (only pilot tone
setting is kept),
receiver is restarted,
standard display appears
"reset" = NO
SET: Reset is cancelled
SET
PILOT
Activating/deactivating
the pilot tone evaluation
PLT. ON
PLT. OFF
Pilot tone evaluation
activated or deactivated
Stores the setting
STORED
SET
LOCK
LOC.OFF
OFF
LOC. ON
Lock mode activated or
deactivated
Activating/deactivating
the lock mode
"Lock mode" = ON
SET: Stores the setting
(“STORED”), returns to
standard display
STORED
"Lock mode" = OFF
Stores the setting
SET
EXIT
Exiting the operating
menu
CHAN
Stereo
selection
BAL.L15
15
Current balance setting
BAL.-0-0: BAL.L 1...15,
BAL.--0--, BAL.R 1...15
/
Focus
selection
Adjusting the balance/
Focus
FOC.L15
15
FOC.-0-0-
SET
Current Focus setting
23
Adjustment tips for the operating
menu
Selecting a channel – CHAN
Via the “CHAN” menu, you can switch between the channels in the
channel banks “F” (fixed bank) or “U” (user bank). The channel
bank “F“ has up to 16 switchable channels that are factory-preset
to customer-specific receiving frequencies. These frequencies
cannot be changed.
The channel bank “U” also has up to 16 switchable channels to store
frequencies that are freely selectable within the preset frequency
range.
Always set the transmitter and the receiver of a transmission link to
the same channel. After scanning the channel bank (see “Scanning
the channel bank for free channels – SCAN” on page 25), only the
free channels are displayed. Set the transmitter to one of the free
channels.
Selecting the frequencies to be stored in the
channel bank “U” – TUNE
Via the “TUNE” menu, you can freely select the frequencies to be
stored in the channel bank “U” (user bank).
Press the SET button to get into the setting mode of the “TUNE”
menu.
Note:
When pressing the SET button for one second, you can use the
/ rocker button to select a different channel for which you
can then change the frequency.
When you have selected the channel bank “F” and then select the
“TUNE” menu, the receiver automatically switches to channel 01 of
the channel bank “U”
Press the / rocker button to select the desired receiving
frequency. Receiving frequencies are tunable in 5-kHz steps
within a switching bandwidth of 36 MHz max.
24
Press the SET button to confirm your selection. The receiver
changes immediately to the new frequency.
Scanning the channel bank for free channels –
SCAN
Before putting one or several transmission links into operation,
you should scan the channel bank for free channels.
Starting the scan and storing the scan result
Before starting the scan, switch all transmitters of your
system off, since channels used by switched-on
transmitters will not be displayed as “free channels”.
Select the “SCAN” menu.
Select “START” and confirm your selection by pressing the
SET button. After the scan is completed, the number of free
channels is displayed. Pressing the SET button once more
will store the scan result and lock all channels that are used
or subject to interference.
Releasing locked channels
Select the “SCAN” menu.
Select “CLEAR” and confirm your selection by pressing the
SET button. All channels can now be selected again.
Adjusting the squelch threshold – SQELCH
The receiver is equipped with a squelch that can be adjusted via
the “SQELCH” menu (see “Squelch” on page 34). The squelch
eliminates annoying noise when the transmitter is switched
off. It also suppresses sudden noise when there is no longer
sufficient transmitter power received by the receiver.
25
Note:
Before adjusting the squelch threshold to a different
setting, use the volume control to set the volume for the
connected headphones to the minimum.
There are three possible squelch setting:
y LO = low
y MID = middle
y HI = high
CAUTION!
High volume levels can damage your hearing!
When in the setting mode of the “SQELCH”
menu, pressing the button for more than
three seconds will switch off the squelch.
“SQ.OFF” appears on the display. If no RF signal
is being received, hissing noise will occur.
This setting is for test purposes only and
must only be used by service technicians.
Selecting the setting “LO” reduces the squelch threshold,
selecting the setting “HI” increases the squelch threshold.
Adjust the squelch threshold – with the transmitter switched
off – to the lowest possible setting that suppresses hissing
noise.
Important note:
y If the squelch threshold is adjusted too high, the transmission range will be reduced. Therefore, always adjust
the squelch threshold to the lowest possible setting.
26
Stereo/FOCUS selection – ST-FOC
Via the “ST-FOC” menu, you can switch between stereo and
FOCUS operation.
In both operating modes, the corresponding transmitter has to
be set to stereo operation.
When the receiver is set to stereo operation, the left-right
signals are available as usual.
When the receiver is set to FOCUS operation, the left-right
signals are mixed and are available as a mono signal in both
headphone channels. With the / rocker button you can
adjust the relative levels of the two separate channels in the
mixed mono signal (see “Adjusting the balance/FOCUS” on
page 17).
Limiting the volume at the headphone output –
LTD
Via the “LTD” menu, you can switch the limiter on or off. With
the limiter switched on, the volume at the headphone output
will be reduced.
Activating/deactivating the frequency boost –
HI-BST
Via the “HI-BST” menu, you can boost the AF frequency
response at 10 kHz by approx. 6 dB. As a result, headphones
with magnetic transducers sound better.
27
Selecting the standard display – DISLPY
Via the “DISPLY” menu, you can select the standard display:
Selectable standard display
Contents of standard
display
“FREQ”
“NAME”
“CHAN”
Entering a name – NAME
Via the “NAME” menu, you can enter a freely selectable name
for the receiver. You can, for example, enter the name of the
performer for whom the adjustments have been made.
This name can be displayed on the standard display and can
consist of up to six characters such as:
y letters (without pronounciation marks),
y numbers from 0 to 9,
y special characters and spaces.
To enter a name, proceed as follows:
Press the SET button to get into the setting mode of the
“NAME” menu. The first segment starts flashing on the
display.
With the / rocker button you can now select a
character. By briefly pressing a button, the display jumps
either forwards or backwards to the next character. If you
hold down a button, the display starts cycling continuously.
28
Press the SET button to change to the next segment and
select the next character.
Have you entered the name completely? Press the SET
button to store your setting and to return to the previous
menu level.
Loading the factory-preset default settings –
RESET
Via the “RESET” menu, you can load the factory-preset default
settings. Only the selected setting for the pilot tone remains
unchanged. After the reset, the receiver is restarted and the
standard display is shown on the display panel.
Activating/deactivating the pilot tone
evaluation – PILOT
Via the “PILOT” menu, you can activate or deactivate the pilot
tone evaluation.
The pilot tone has two functions:
y Stereo identification
y Squelch control
When used with a suitable transmitter which adds a pilot tone
to the transmitted stereo signal, the receiver can evaluate this
pilot tone. When the transmitter is set to mono operation, you
have to deactivate the pilot tone evaluation on the receiver.
Activating/deactivating the lock mode – LOCK
Via the “LOCK” menu, you can activate or deactivate the lock
mode.
The lock mode prevents that the receiver is accidentally
programmed during operation. However, the volume can be
adjusted at any time.
29
Press the two unlocking buttons and open the battery
compartment cover .
Press the SET button . “LOC.ON” and the lock mode icon
appear on the display.
Press the / rocker button . “LOC.OFF” flashes on the
display.
Confirm your selection by pressing the SET button .
“STORED” appears on the display and the lock mode is
deactivated.
Exiting the operating menu – EXIT
Via the “EXIT” menu, you can exit the operating menu and
return to the standard display.
30
If problems occur ...
Error checklist
Problem
No
operation
indication
No RF signal
Possible cause
Batteries are flat or
accupack is flat
Possible solution
Replace the batteries
or recharge the
accupack
Transmitter and
Set transmitter and
receiver are not on the receiver to the same
same channel
channel
Transmitter is out of
Check the squelch
range
threshold setting
or change the position
of the transmitting
antenna
Receiver’s squelch
See “Adjusting the
threshold is adjusted squelch threshold –
too high
SQELCH” on page 25
Transmitter does not Set the transmitter to
transmit a pilot tone
stereo operation or
deactivate the pilot
tone evaluation on the
receiver
RF signal
available,
no audio
signal,
“MUTE”
display
appears on
the display
panel
No access to During scanning, an RF
a certain
signal has been
channel
detected on this
channel and the
channel has been
locked
See “Scanning the
channel bank for free
channels – SCAN” on
page 25
If problems occur that are not listed in the above table or if the
problems cannot be solved with the proposed solutions, please
contact your local Sennheiser agent for assistance.
31
Recommendations and tips
... for the receiver
y The antenna must not be in direct contact with the body.
... for optimum reception
y Reception range depends to a large extent on location. There
should be a “free line of sight” between transmitting and
receiving antennas.
y To avoid overmodulating the receiver, observe a minimum
distance of 5 m between transmitting and receiving antennas.
... for multi-channel operation
y When operating a multi-channel system, make sure to only
use intermodulation-free frequencies.
Maintenance and care
CAUTION!
Water can damage the electronics of the
receiver!
Water entering the housing of the receiver can
cause a short-circuit and damage the
electronics.
Only use a slightly damp cloth to clean the
receiver.
If necessary, you can clean the receiver with a slightly damp
cloth. Do not use any cleansing agents or solvents.
32
Additional information
HDX noise reduction
RF link
Inherent
noise
of the
RF link
Transmitter
Receiver
Progress you can hear:
The product family is equipped with HDX, the Sennheiser noise
reduction system that reduces RF interference. It increases the
signal-to-noise ratio in wireless audio transmission to more
than 90 dB.
HDX is a wideband compander system which compresses the
audio signal in the transmitter in a 2:1 ratio (related to dB) to
lift it above the inherent noise floor of the RF link. In the
receiver the signal is expanded in an identical and opposite way
in a 1:2 ratio to restore the original signal, at the same time
reducing the RF noise to below the noise floor of the receiver.
HDX has been specially developed for high quality radio
microphone systems.
Note:
Only transmitters and receivers that are equipped with HDX
can work correctly with each other. If non HDX equipment
was mixed with HDX, the dynamic range would be
drastically reduced and the transmission would sound
blunt and flat.
33
Squelch
Pilot tone squelch
When set to stereo operation, the transmitter adds a 19-kHz
pilot tone to the audio signal. The receiver checks incoming
audio signals to see if the pilot tone is present. In the absence
of the 19-kHz signal, the receiver’s audio output will remain
muted, even if a strong RF signal is present.
This prevents strong interfering signals from causing hissing
noise in the receiver when the transmitter is switched off.
Field strength-dependent squelch
Depending on the strength of the received RF signal, the
receiver’s audio output is opened or muted. Via the “SQELCH”
menu of the receiver, the squelch threshold can be adjusted in
three steps (LO, MID, HI).
34
Specifications
EK 3253 bodypack receiver
RF characteristics
Modulation
Frequency ranges
Receiving frequencies
Switching bandwidth
Nominal/peak deviation
Pilot tone
(frequency/deviation)
Frequency stability
FM stereo
518–554, 626–662,
740–776, 786–822,
830–866 MHz
1 channel bank with up to 16
factory-preset channels
1 channel bank with up to 16
freely selectable channels
(frequencies tunable in steps
of 5 kHz)
36 MHz
±24 kHz / ±48 kHz
19 kHz / ±5 kHz
≤±20 ppm (-10 to +55°C)
Sensitivity
(with HDX, peak deviation)
typ. 1.5 μV at 52 dBArms S/N
Adjacent channel rejection
Intermodulation attenuation
Blocking
Squelch
typ. 75 dB
typ. 75 dB
typ. 90 dB
4 steps: OFF
LO: 5 dBμV
MID: 15 dBμV
HI: 25 dBμV
AF characteristics
Noise reduction system
AF frequency response
Signal-to-noise ratio
(1 mV, peak deviation)
Sennheiser HDX
40–15,000 Hz
≥ 91 dB(A)
THD (at nom. deviation, 1 kHz) ≤0.9 %
Headphone output
3.5 mm jack socket
35
AF output power (at peak
deviation, 1 kHzAF) PHONES
Overall unit
Temperature range
Power supply
Nominal voltage
Power consumption
Power consumption with
switched-off receiver
Operating time
(with batteries)
Operating time
(with BA 2015 accupack)
Dimensions in mm
Weight (incl. batteries)
Type approval
2 x 100 mW at 32 Ω
-10 °C to +55 °C
2 AA size batteries, 1.5 V
2.4 V
approx. 190 mA
≤250 μA
6–10 hrs
(depending on volume)
6–10 hrs
(depending on volume)
82 x 64 x 24
approx. 200 g
Canada: RSS-123
IC: 2099A-SREK3K
EU:
ETSI EN 300 454-1/-2
IE 4 earphones
Frequency response
Max. sound pressure level
Impedance
40–20,000 Hz
118 dB SPL
32 Ω
Connector assignment
3.5 mm jack plug
for headphone output
Accessories
IE 4:
IES 4:
BA 2015:
L 2015:
36
Earphones
1 pair of ear sleeves for IE 4 earphones
Accupack
Charger for BA 2015 accupack
Warranty regulations
The guarantee period for this Sennheiser product is 24 months
from the date of purchase. Excluded are accessory items,
rechargeable or disposable batteries that are delivered with
the product; due to their characteristics these products have a
shorter service life that is principally dependent on the
individual frequency of use.
The guarantee period starts from the date of original purchase.
For this reason, we recommend that the sales receipt be
retained as proof of purchase. Without this proof (which is
checked by the responsible Sennheiser service partner) you will
not be reimbursed for any repairs that are carried out.
Depending on our choice, guarantee service comprises, free of
charge, the removal of material and manufacturing defects
through repair or replacement of either individual parts or the
entire device. Inappropriate usage (e.g. operating faults,
mechanical damages, incorrect operating voltage), wear and
tear, force majeure and defects which were known at the time
of purchase are excluded from guarantee claims. The guarantee
is void if the product is manipulated by non-authorised persons
or repair stations.
In the case of a claim under the terms of this guarantee, send
the device, including accessories and sales receipt, to the
responsible service partner. To minimise the risk of transport
damage, we recommend that the original packaging is used.
Your legal rights against the seller, resulting from the contract
of sale, are not affected by this guarantee.
The guarantee can be claimed in all countries outside the U.S.
provided that no national law limits our terms of guarantee.
EC Declaration
of Conformity
This equipment is in compliance with the essential
requirements and other relevant provisions of Directives 1999/
5/EC, 89/336/EC or 73/23/EC. The declaration is available on
the internet site at www.sennheiser.com.
Before putting the device into operation, please observe the
respective country-specific regulations!
37
Sennheiser electronic GmbH & Co. KG
30900 Wedemark, Germany
Phone +49 (5130) 600 0
Fax +49 (5130) 600 300
www.sennheiser.com
Printed in Germany
Publ. 08/05
512765/A01